Manganese-Assisted Carbon Nitride/Carbon Nanoribbons Heterojunction for Efficient Photocatalytic H2O2 and H2 Production.

The simultaneous photocatalytic production of hydrogen peroxide (H₂O₂) and hydrogen (H₂) from water has received widespread attention. However, the inherent inefficiencies in dynamic processes, such as sluggish charge separation or accumulation, pose substantial limitations to overall photocatalytic performance. Here, a manganese-assisted carbon nitride/carbon nanoribbons (CN/CT-Mn) heterojunction is developed via a straightforward thermal evaporation process. The optimized CN/CT-Mn photocatalyst demonstrates exceptional activity for concurrent H₂O₂ and H₂ production under ambient conditions, achieving impressive yields of 104 and 720 μmol g^-1 h^-1, respectively. The enhanced performance can be attributed to the enhanced charge separation and the regulation of electron reduction kinetics resulting from the construction of the heterojunction interface. Notably, the presence of Mn atoms introduces an additional impurity level, enabling precise control over the reduction selectivity of photogenerated electrons.